Impact of time and personnel on measurements of the hygric properties of building materials

This paper studies the impact of time and personnel on measurements of hygric properties. Vacuum saturation, capillary absorption, vapor diffusion and static gravimetric tests have been done twice on calcium silicate and autoclaved aerated concrete, first in 2013 and again in 2016-2017. All these tests have also been performed by two different operators on ceramic brick. Results show that the impact of time is very limited, and that different operators also give very similar results, except for the vapor resistance factor, which is sensitive to varied sealing and data processing methods.